Maria Sharapova defeated Flavia Pennetta 7-5 6-1 in the Singapore round robin on hard. The upset overturned the form book — Flavia Pennetta came in leading the head-to-head 3–2. That levelled the head-to-head at 3–3.
Sharapova M. took it in straight sets.
Sharapova M. and Pennetta F. faced 14 of the same opponents in the last 12 months. Sharapova M. went 16–3 (84%) against them, Pennetta F. 12–8 (60%). Sharapova M. came out better against 6 of 14 comparable opponents, Pennetta F. against 3.
Hard: Pennetta F. leads 3–2 · Grass: Sharapova M. leads 1–0
Maria Sharapova beat Flavia Pennetta 7-5 6-1. Umpiry, "Maria Sharapova vs Flavia Pennetta — Singapore Round Robin", https://umpiry.com/match/2015-10-29/pennetta-vs-sharapova-singapore-rr?utm_source=cite (as of 29 October 2015).